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COM20051+ Datasheet(PDF) 4 Page - SMSC Corporation

No. de Pieza. COM20051+
Descripción  Integrated Microcontroller and Network Interface with Watchdog Timer and A/D Converter Interface
Descarga  92 Pages
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Fabricante  SMSC [SMSC Corporation]
Página de inicio  http://www.smsc.com
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COM20051+ Datasheet(HTML) 4 Page - SMSC Corporation

 
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4
OVERVIEW
The
COM20051+
is
essentially
a
data
acquisition/network board-in-a-chip. It takes an
80C32-like microcontroller core, an ARCNET
controller, a watchdog timer, and an analog data
acquisition port and integrates them into a
single device.
ARCNET is a token passing-
based protocol that combines powerful flow
control,
error
detection,
and
diagnostic
capabilities
to
deliver
fast
and
reliable
messages. The COM20051+ supports a variety
of data rates (5 Mbps to 156 Kbps), topologies
(bus, star, tree), and media types (RS-485,
coax, twisted pair, fiber optic, and powerline) to
suit any type of application.
The ARCNET network core of the COM20051+
contains many features that make network
development simple and easy to comprehend.
Diagnostic
features,
such
as
Receive
All,
Duplicate
ID
Detection,
Reconfiguration
Detection, Token, and Receiver Detection, all
combine to make the COM20051+ simple to use
and to implement in any environment.
The
ARCNET protocol itself is relatively simple to
understand and very flexible. A wide variety of
support products are available to assist in
network development, such as software drivers,
line drivers, boards, and development kits. The
COM20051+ implements a full-featured 16MHz,
Intel code-compatible 80C32-like microcontroller
with all of the standard peripheral functions,
including
a
full
duplex
serial
port,
two
timer/counters, one 8-bit general purpose digital
I/O port, and interrupt controller.
The 8051
architecture has long been a standard in the
embedded control industry for low-level data
acquisition and control. ARCNET and the 8051
form a simple solution for many of today's and
tomorrow's low-level networking solutions.
The COM20051+ also includes a programmable
watchdog timer for fail-safe operation.
The
watchdog timer has programmable timeout
values ranging from 3.3ms to 6.5s, with a
programmable reset feature (either a pulsed
reset or reset and hold).
A full analog data
acquisition
port
is
also
included
in
the
COM20051+.
The
data
acquisition
port
interfaces
to
most
types
of
parallel
A/D
converters. The data acquisition port provides
all the handshaking and data buffering fuctions
normally associated with repetitive sampling
tasks.
An internal 32-byte FIFO buffers the
samples in chronological order and interrupts
the
processor
at
a
programmed
limit.
Offloading repetitive sampling and buffering
tasks frees the microcontroller core tasks such
as
data
formatting
and
processing
and
communications tasks.
In addition to the 80C32 and the ARCNET
network core, the COM20051+ contains all the
address decoding and interrupt routing logic to
interface the network core, the watchdog timer,
and the data acquisition port to the 80C32 core.
The
integrated
8051/ARCNET
combination
provides an extremely cost-effective and space-
efficient
solution
for
industrial
networking
applications. The COM20051+ can be used in a
stand-alone embedded application, executing
control
algorithms
or
performing
data
acquisition
and
communicating
data
in
a
master/slave or peer/peer configuration, or used
as a slave processor handling communication
tasks in a multi-processing system.


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